Fireproof dcor



E. R. LEONARD.

v FIREPROOF DOOR.

APPLICATION FILED JUNE 7, 1921.

1,402,874. Patented Jan. 10, 1922.

55 l/ r l Z 3 J1 J2 v INVENTOR ATTORNEY ELOF B. LEONARD, OF MOUNTAIN LAKES, NEW JERSEY.

FIREPROOF DOOR.

incest i.

Specification of Letters Eatent.

Patented J an. 10, 1922.

Application filed. June 7, 1921. Serial No. 475,648.

To all whom it may concern:

Be it known that I, ELor R. LEONARD, a citizen of the United States, residing at Mountain Lakes, Morris County, New Jersey, have invented certain new and useful Improvements in Fireproof Doors, of which the following is a specification.

My invention relates to doors, or the like, which are intended to resist heat, as in fire doors, or cold as in the case of refrigerator doors. And my improvements are directed to means whereby the thickness of such doors may be substantially reduced, with consequent economy in the use of material and in the space taken up by the door,'and without sacrificing the efficiency of the door as a temperature resisting means.

In the drawings, Fig. 1 is a front elevation of a pair of my improved doors; Fig. 2 is a cross sectional view, on an enlarged scale, of a single door with thedoor jambs; Fig. 3 is a cross sectional detail of the meeting edges of a pair of folding doors; and Fig. 4 is a cross sectional detail of the inner edge of a modified form of door adapted to be hung with butt hinges.

In all the figures similar parts are designated by similar reference numerals.

Each side of the improved door is formed of a series of plates joined togetherby'integral flanges having the form of lap seams, the sections being adapted to be united by sliding the flange of one section, lengthwise into the flange of the next section; the edges of the door being formed by strips similarly comected by interlocking lap seams with the $1 es.

Thus, in the drawings, 1, 1 are the series of plates forming one face of the door; and 2, 2 are the series of plates forming the other face. Each of the sections 1, 1, is provided upon the edge adjacent to the next section with a folded-over flange 3, adapted to interlock with a complementary flange 4 on the next section. And the sections 2, 2 are provided upon their meeting edges with similar flanges 5, 6. i

In Fig. 2 I have shown the inner edge of the door as being formed with a channelled strip 7 having a folded-over flange 8 to interlock with an outwardly folded flange 9 on the plate 1; while the strip 7 is also provided with an inturned flange 10 adapted to interlock with an inturned flange 11 on the plate 2.

This arrangement gives a smooth even surface on the face of the door to receive the stra) hinge 12, adaptedto be, swung on the pint e 13, secured to the jamb 1 1.

In Fig. ethe edge strip 15 is formed to give a flush finish, both of its marginal flanges 16, 17 being inturned, and locking withcomplementary flanges 18, 19 on the door plates 1 and 2.

Thls modification permits of the use of butt hinges, which can be attached by bolts passing through all the flanges 16, 18, 17, 19, as shown. The outer edge of the door is preferably finished in a way corresponding with that shown in Fig. 4, just described}- a flush strip with inturned flanges being interlocked with outwardly turned flanges on the face plates.

But this construction may be modified as shown in Fig. 3, wherein the flange on one edge of the strip is thrown forward as at 20, the complementary flange 21 on the face plate being similarly advanced, and also being recessed so as to receive and hold a stiffening strip 22, of steel or the like. The meeting edge of the other half door 23 :is recessed, and has its flange turned in to interlock with an outturned flange 2 1 on the edge strip 25.. This gives a tight, strong and durable construction for meeting edges.

Between the side sections of the door I insert a sheet 26 of temperature'resisting material, such as asbestos, the edges of which are preferably held in the seams between the face plates and the edge strips, as shown, while the sheet is held at intermediate points between the interlocking flanges from one side and the inside of the face plates on the other side.

This construction securely holds the asbestos sheet in place while it also prevents direct contact between the flanges and their opposed face plates; thus materially resisting the transmission of heat or cold from one side of the door to the other. It also gives the advantages derived from an air space and an intermediate temperature resisting material, which are important. And the arrangement whereby the flanges from And when they are in place and the door is closed in the result is a strong, compact,

, thin door which will successfully withstand wide variations of temperature.

The attachment of the strap hinges 12, 12, or the. butt hinges 28, by bolts passing through the door from side to side still further clamps the sides of the door together and strengthens the assembled construction.

It will be understood that details of construction may be further varied, as by the use of mechanical equivalents, without departing from the spirit of my invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States is 1. A hollow, metal door, having sides each composed of a plurality of sheet metal elements joined by interiorly disposed, interlocking, lap-seam flanges extended toward an unseamed portion of the opposite side, edge elements uniting the sides, stiffening elements disposed transversely through the interiorly disposed flanges, and an insulating element held between the flanges and the inner faces of the sides.

2. A hollow, metal door, having sides each composed of a plurality of sheet metal elements joined by interiorly disposed, interlocking, lap-seam flanges extended toward an unseamed portion of the opposite side, edge elements uniting the sides, stiffening elements disposed transversely through the interiorly disposed flanges, and an insulating element consisting of a sheet of flexible material held between the flanges and the inner faces of the sides. 7

3. A hollow, metal door, having sides each composed of a plurality of sheet metal elements joined by interiorly disposed, interlocking, lap-seam flanges extended toward an unseamed portion of the opposite side, edge elements uniting the sides, stiffening elements disposed transversely through the interiorly disposed flanges, and an insulating element consisting of a sheet of flexible ma terial, deflected alternately from side to side of the door, and held between the flanges and the inner faces of the sides.

4. A hollow, metal door, having sides each composed of a plurality of sheet metal elements joined by interiorly disposed, interlocking, lap-seam flanges extended'toward an unseamed portion of the opposite side, edge elements uniting the sides, and stiffening elements disposed transversely through the interiorly disposed flanges.

ELOF R. LEONARD. 

